I think I wanna redo this

So, I think I want to redesign my blog but, honestly, I don't know nearly any CSS, and I know very little HTML. What ever am I to do? I should learn that stuff, I am in design after all. I'll work on that. but for now this stays untouched, because I don't feel like dealing with it, maybe a new banner/border soon, and this green is started to make me sad.